[PATCH 5/5] vfs_default: add copy_file_range support for copy chunk

[Björn Jacke]

On 2017-01-22 at 14:09 +0100 David Disseldorp sent off:
> That sounds like a horribly broken API. Do you have a standalone test
> for this? Looking at the kernel VFS implementation[1], that doesn't
> appear to be the case - what does happen to the off_in/off_out args is
> that on success they're incremented by the amount copied, so maybe your
> previous implementation was incorrectly updating the offsets twice, i.e.
> once in kernel and again in your copy loop?

I misunderstood how it was meant to work. Got it now and I got rid of the
lseeks.

See attached patch which also leaves the manual rw loop logic alone now.

Björn
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